(Answered) The life in hours of a battery is known to be approximately

Statistics

The life in hours of a battery is known to be approximately normally distributed, with standard deviation s = 1.25 hours. A random sample of 10 batteries has a mean life of x ¯=40.5 hours.

(a) Is there evidence to support the claim that battery life exceeds 40 hours? Use a = 0.05.

(b) What is the P-value for the test in part (a)?

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